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利用激光熔化沉积工艺制备了TiB+TiC增强相体积分数分别为9%、11%、22%及57%的4种(TiB+TiC)/TA15原位钛基复合材料。随增强相含量提高,TiB形态由片层状向棱柱状转化,TiC形态由不规则颗粒状向枝晶状转化,钛基复合材料硬度及弹性模量均显著提高而塑性明显下降。增强相体积分数约为9%的复合材料表现出较好的综合力学性能,增强相体积分数大于11%后复合材料的抗拉强度急剧降低。与激光熔化沉积态TA15钛合金相比,TiB+TiC增强相体积分数约为9%的复合材料抗拉强度(1040 MPa)及屈服强度(935 MPa)均提高约12%。
Four (TiB + TiC) / TA15 in-situ titanium matrix composites with volume fraction of TiB + TiC reinforcing phase of 9%, 11%, 22% and 57% were prepared by laser melting deposition. With the increase of phase content, the morphology of TiB transformed from lamellar to prismatic, the morphology of TiC transformed from irregular granular to dendritic, the hardness and elastic modulus of Ti-based composites increased significantly and the plasticity decreased obviously. The composites with increasing phase volume fraction of about 9% show better mechanical properties, and the tensile strength of the composites decreases sharply when the phase volume fraction is more than 11%. The tensile strength (1040 MPa) and yield strength (935 MPa) of composites with TiB + TiC reinforcing phase of about 9% were both increased by about 12% compared with TA15 titanium alloy.